There are a few things you could do to either downgrade or make good use of the new space you have.
1) Take the opportunity to use the space productively, renovate their old bedrooms and turn them into guest rooms or recreation rooms.
2) Keep costs down by selling the house and downgrade to something more suited to your needs like an apartment or unit.
3) Go on a much needed holiday, now that you no longer need to look after anyone what is stopping you going on that round the world trip you always dreamed of?
No matter what you decide to do take the time to enjoy yourself! Do you have any tips on how to keep busy after the kids have left? Leave a comment we would love to know!